Plectocomiopsis

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Plectocomiopsis
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Arecales
Family: Arecaceae
Subfamily: Calamoideae
Tribe: Calameae
Genus: Plectocomiopsis
Becc. [1]
Species

Plectocomiopsis is a dioecious genus of flowering plant in the palm family found in Indochina, Malaysia, Borneo and Sumatra. [2] Hapaxanthic and armed with spines, they are a climbing rattan, closely related to the Myrialepis palms. [3] The name is Greek for "similar to Plectocomia ", another close relative. [4]

Contents

Description

The stems are small, densely clustering, spiny, and high climbing with long internodes and conspicuous scars. Young leaves are undivided or with few segments, in maturity becoming pinnate and cirrate with a tubular, unarmed or sparsely armed, scaly leaf sheath. Ocreas present, entire or becoming tattered. The petiole, when present, and the proximal end of the rachis are deeply channeled and spiny; the cirrus and distal end of the rachis are armed with regularly arranged reflexed climbing spines. The single fold, lanceolate leaflets may be few to numerous, usually with armed margins and caducous scales, with conspicuous midribs and transverse veinlets.

The inflorescence is produced at the top of the stem amongst the most distal, often reduced leaves, axis adnate to the internode and emerging from the leaf sheath mouth. The peduncle is short, the prophyll is tubular and two-keeled, peduncular bracts usually absent, and the rachis is much longer than the peduncle. The rachis bracts are tubular and more or less distichous, each subtending a horizontal or pendulous first order branch which features basal, tubular bracts with triangular limbs carrying monopodial flower clusters. In P. corneri the inflorescence is branched to three orders instead of two, with flowers borne on the axes of all orders.

The male flowers are arranged in clusters of up to 32, each flower held in a cuplike rachilla bract with a two-keeled bracteole. The calyx is thick, leathery and tubular, with three lobes, and abaxially covered in scaly trichomes; the corolla is similar, with two distal splits forming three triangle shaped lobes, also bearing scales. The six stamens are laterally fused forming a tube which is tipped by six free, reflexed filaments with short, oblong anthers. The pollen is discate[ check spelling ] and elliptic with tectate exine; pistillode minute. [3]

Female flowers are usually borne in clusters of two to four but may be solitary, and, like the male's, are carried in cuplike bracts with two-keeled bracteoles, with the occasional barely developed second bracteole. The calyx is also thick and leathery, thrice lobed and scaly, usually persistent into fruit; corolla leathery, scaly, with three lobes. The staminodial ring bears six short lobes and sagging, empty anthers; gynoecium egg-shaped to cylindrical, the apical stigmas becoming scaly nearing antithesis. Three incomplete locules are present, each bearing one antropous, basally attached ovule. The fruit has one, rarely two seeds, covered in persistent perianth whorls, and stigmatic apical remains. The epicarp is matted in irregular vertical rows of reflexed scales, with a thin mesocarp and an undifferentiated endocarp. The seed is basally attached, spherical, usually depressed, with a thick sarcoesta, a homogeneous endosperm and a basal embryo. [3]

Distribution and habitat

Plectocomiopsis triquetra and P. wrayi are low land peat swamp forest inhabitants, the former in Borneo, the latter in Malaysia. P. corneri and P. mira are Dipterocarp forest dwellers to 700 m, and P. geminiflora is distributed through a variety of tropical forest types to 1200 m. [3]

Cultivation and uses

The Plectocomiopsis species are not usually cultivated, being extremely spiny and requiring particular tropical conditions. In their natural range they are used in basketry, however their fragile nature prevents them from being a common rattan source. The palm heart of P. geminiflora, despite its bitter taste, is regarded as a delicacy in Borneo; [3] villagers regard some of the others as edible and some as poisonous.

Related Research Articles

<i>Acanthophoenix</i> Genus of palms

Acanthophoenix is a genus of flowering plants in the palm family from the Mascarene Islands in the Indian Ocean, where they are commonly called palmiste rouge. A genus long in flux, three species are currently recognized, though unsustainable levels of harvesting for their edible palm hearts have brought them all to near extinction in habitat. They are closely related to the Tectiphiala and Deckenia genera, differing in the shape of the staminate flower. The name combines the Greek words for "thorn" and "date palm".

Calospatha is an extremely rare, monotypic genus of flowering plant in the palm family found in peninsular Malaysia, where it is referred to as rotan demuk. It is not common in collections, nor has it been found in the wild for several years, leading some to conclude that the species may have become extinct. While not specialized for the task, these dioecious palms are noted for their climbing habit. The genus name is a combination of two Greek words meaning 'beautiful' and 'spathe'.

<i>Eleiodoxa</i> Genus of palms

Eleiodoxa is a monotypic genus of flowering plant in the palm family found in Southeast Asia. The only species, Eleiodoxa conferta, is a dioecious, swamp-dwelling plant, commonly called by Malay as asam kelubi or asam paya. While five species names have been published, the other four are usually recognized as synonyms of the lectotype E. conferta. The genus is named from two Greek words meaning "water" and "glory" and the species name is Latin for "congested", an allusion to the flower spike.

Eremospatha is a genus of climbing flowering plants in the palm family found in tropical Africa. These rattans are uncommon in cultivation and poorly understood by taxonomists;. Closely related to Laccosperma, they differentiated by the near complete absence of bracts and bracteoles. The name is from Greek meaning "without a spathe".

<i>Korthalsia</i> Genus of palms

Korthalsia is a clustering genus of flowering plant in the palm family spread throughout Southeast Asia. It is a highly specialized rattan with some species known to have an intimate relationship with ants, hence the common name ant rattan. High-climbing and armed with spines, the genus is named for the Dutch botanist P. W. Korthals who first collected them from Indonesia.

Laccosperma is a clustering genus of flowering plant in the family palm found in tropical Africa. Poorly studied and rarely cultivated, they are closely related to the genus Eremospatha and with it form a tribe in the Calameae characterized by dyads of hermaphrodite flowers. The genus name combines the Greek words for "reservoir" and "seed".

<i>Myrialepis</i> Genus of palms

Myrialepis is a monotypic genus of flowering plant in the palm family, the single species, Myrialepis paradoxa, native to Southeast Asia. The genus name is a combination of the Greek words meaning "innumerable" and "scale", a description of the fruit, and the epithet is Latin for "paradox".

<i>Ceratolobus</i> Genus of palms

Ceratolobus was a dioecious genus of flowering plants in the palm family found in Southeast Asia, commonly called rotan. Its species are now included within the genus Calamus. They are only differentiated from close relatives like Korthalsia, Calamus, and Daemonorops by leaf sheath appendages or inflorescence variations. The Greek genus name combines "horn" and "capsule".

Nenga is a monoecious genus of flowering plant in the palm family. It is native to Southeast Asia and commonly called pinang palm. N. gajah is the aberration in the genus with its short internodes, marcescent leaves and interfoliar inflorescence, a combination of traits seen in a few species of the closely related Pinanga and Areca palms. The genus name is based on a corruption of a Javanese term for a plant now classified within Pinanga.

Oncocalamus is a monoecious genus of flowering plants in the palm family found in western Africa. The genus is the lone member of the Oncocalaminae; once placed with the vegetatively similar Eremospatha and Laccosperma in the Ancistrophyllinae, it is now isolated based on their unusual flowers and arrangement. Such a placement argues for a long and complex evolutionary process in the Calamoideae with heavy extinction rates. The Greek genus name combines "horn" and "capsule".

Pogonotium was a dioecious genus of flowering plant in the palm family found in Malaysia and Borneo. Its species are now included within the genus Calamus. Its close relatives are climbing rattans and while partially armed with climbing apparatus, its habit is sprawling and leaning but not effective climbing. The reduced inflorescence nestled between the auricles is unusual and distinguishes it from similar relatives like Calamus, Daemonorops and Ceratolobus. The name is Greek meaning "bearded".

<i>Allagoptera caudescens</i> Species of palm

Allagoptera caudescens is a species of flowering plant in the palm family endemic to Brazil, where it is known as buri palm. The older name Polyandrococos combines the Greek words for "many" and "anther" with the name of another palm genus Cocos, and the epithet is Latin for "bearlike", referring to the hairy tomentum. It was formerly classified as Polyandrococos caudescens, the only species in the genus Polyandrococos.

<i>Ptychococcus</i> Genus of palms

Ptychococcus is a monoecious genus of flowering plant in the palm family from New Guinea and the Solomon Islands. They are closely related to Ptychosperma, only differentiated by the seed shape and endocarp type. The name is a combination of the Greek for "fold" and the Latin for "berry".

Retispatha is a rare, monotypic genus of flowering plant in the palm family endemic to Borneo, where the sole species, Retispatha dumetosa, is known as wi tebu bruang or 'the bear's sugar cane'. The name combines Latin and Greek words meaning 'network' and 'spathe', and the species epithet means 'bushy'. While classified with other rattans, they retain only superficial climbing organs; they sprawl and lean but are not true climbers.

Sclerosperma is a monoecious genus of flowering plant in the palm family found in Africa where three species are known. Having no obvious relatives, it does resemble the Madagascar native Marojejya though a detailed study of Madagascar's palms is required to determine if any true relationship exists. The lack of relatives, and its interesting qualities, indicate, at one time, the existence of a diverse African palm flora. The name is from two Greek words meaning "hard" and "seed".

<i>Sommieria</i> Genus of palms

Sommieria is a monotypic genus of flowering plant in the palm family endemic to New Guinea where they grow in rain forest understory. The sole species is Sommieria leucophylla. They resemble the Asterogyne palms but are most closely related to those members of Heterospathe with short stems and sparsely branched inlforescences. The name honors Stephen Sommier, European botanist.

<i>Synechanthus</i> Genus of palms

Synechanthus is a monoecious genus of flowering plant in the palm family found in Mexico, Central and South America. Commonly called bola, palmilla, or jelly bean palm, they are closely related to members of Chamaedorea, only distinguished by their flower and fruit form. The Greek genus name is a combination of "united" and "flower".

<i>Cyphophoenix alba</i> Species of palm

Cyphophoenix alba is a species of palm in the family Arecaceae endemic to New Caledonia. It was previously placed in the genus Veillonia.

Calamoideae Subfamily of palms

Calamoideae is a subfamily of flowering plant in the palm family found throughout Central America, South America, Africa, India, China, Southeast Asia and Australia. It is represented by 21 genera - containing nearly a quarter of all species in the palm family - including the largest genus, Calamus, the type genus of the group. Only four are found in the New World while the rest are Old World denizens, usually found in equatorial swampland or along tropical coastlines.

Calamus erectus, also known as viagra palm and locally as tynriew, tara, and zhi li sheng teng, is a flowering shrub in the family Arecaceae. The specific epithet (erectus) refers to the plant's habit of growing straight rather than creeping or climbing like many species of the genus Calamus.

References

  1. Beccari in J.D. Hooker, Flora of British India 6:479. 1893.
  2. Kew World Checklist of Selected Plant Families
  3. 1 2 3 4 5 Uhl, Natalie W. and Dransfield, John (1987) Genera Palmarum - A classification of palms based on the work of Harold E. Moore. Lawrence, Kansas: Allen Press. ISBN   0-935868-30-5 / ISBN   978-0-935868-30-2
  4. Riffle, Robert L. and Craft, Paul (2003) An Encyclopedia of Cultivated Palms. Portland: Timber Press. ISBN   0-88192-558-6 / ISBN   978-0-88192-558-6